Achieve superior performance in every brushed application with TB67H400AFTG and PIC18F57Q43

DC MOTOR 7 Click is based on the TB67H400AFTG, a PWM chopper-type brushed DC motor driver from Toshiba Semiconductor. This IC uses a proprietary BiCD manufacturing process, allowing this IC to be powered by a wide range of supply voltages, from 10V up to 47V. Due to the MOSFETs' very low ON resistance, the TB67H400AFTG can deliver up to 4A of current to the connected load. However, many external parameters affect both the maximum voltage and the current specifications, especially when the connected load is complex, such as the DC motor. This IC offers an alternative mode, where it can use its internal H-Bridges in parallel, offering twice as much power for a single motor. Before attempting to connect a single DC brushed motor, please refer to the datasheet of the TB67H400AFTG for precise connection instructions. DC MOTOR 7 click requires an external power supply for operation. The optimal voltage that should be used is 24V. Although the TB67H400AFTG driver has thermal and overcurrent protection, it is a temporary measure. A short-circuit at the output terminal may damage the Click board™. There are two output terminals used to connect DC motors and a power supply input terminal, where the external PSU can be connected, with respect to the polarity marked on the Click board™ itself (bottom side). Brushed DC motors are typically made with only two conductors to supply the motor with power, so even controlling the direction can be

challenging in some situations. Therefore, a specialized driver circuit is required. The TB67H400AFTG utilizes two sensing resistors (one for each channel) and an internally generated PWM signal to regulate the current through the motor. This results in better efficiency and less heat dissipation and provides control over the motor's torque, direction, and speed. Each motor is driven by the internal H-Bridge, which is controlled by the control logic section of the TB67H400AFTG IC. The motor control logic section regulates the current by opening and closing the specific MOSFETs of the H-Bridge, allowing the current through the coils to rise to a certain point (charging) to circulate between the coils and the driver until a specified point of time reached (slow decay), and then to return the remaining energy to the power supply (fast decay). The whole cycle is timed by pulses of the PWM signal derived from the internal oscillator. The TB67H400AFTG exposes six control pins to the microcontroller (MCU): PWMA, PWMB, INA1, INA2, INB1, and INB2. By changing the logic states on these pins, the MCU can control both connected motors independently. Besides a detailed explanation of the operating modes, the TB67H400AFTG datasheet also provides a truth table that explains the effects of logic states on these pins. Since the TB67H400AFTG IC has six different control pins, an additional port expander IC is required to access all these pins.

The PWMA and PWMB pins are routed to the mikroBUS™ RST and PWM pins, respectively, while the rest of the control pins (INA1, INA2, INB1, and INB2) are accessible via the PCA9538A, an 8-bit I2C port expander by NXP Semiconductors. In addition, the HBMODE pin used to select the single or dual operating mode (Large Mode or Small Mode) and the TBLKAB pin used to set the blanking interval are also available over the PCA9538A IC. Logic states on the PCA9538A pins can be easily set over the I2C interface, allowing to quickly change states on all the control pins of the TB67H400AFTG IC using a single command over the I2C interface. Please note that the state of the HBMODE pin should not be altered once the Click board™ is powered up and initialized. The slave I2C address of the PCA9538A can be changed. Two LSB of the I2C address can be set to 0 or 1 by switching SMD jumpers on the Click board™. This allows four different 7-bit I2C addresses to be selected from 0x70 to 0x73. This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the SMD jumper. This way, both 3.3V and 5V capable MCUs can use the communication lines properly. However, the Click board™ comes equipped with a library containing easy-to-use functions and an example code that can be used, as a reference, for further development.

PIC18F57Q43 Curiosity Nano evaluation kit is a cutting-edge hardware platform designed to evaluate microcontrollers within the PIC18-Q43 family. Central to its design is the inclusion of the powerful PIC18F57Q43 microcontroller (MCU), offering advanced functionalities and robust performance. Key features of this evaluation kit include a yellow user LED and a responsive

mechanical user switch, providing seamless interaction and testing. The provision for a 32.768kHz crystal footprint ensures precision timing capabilities. With an onboard debugger boasting a green power and status LED, programming and debugging become intuitive and efficient. Further enhancing its utility is the Virtual serial port (CDC) and a debug GPIO channel (DGI

GPIO), offering extensive connectivity options. Powered via USB, this kit boasts an adjustable target voltage feature facilitated by the MIC5353 LDO regulator, ensuring stable operation with an output voltage ranging from 1.8V to 5.1V, with a maximum output current of 500mA, subject to ambient temperature and voltage constraints.